Xantrex Freedom XC PRO Series Owner's Manual page 103

Problem
The fan turns on and off during AC
shore power mode.
The fan turns on and off during inverter
mode.
975-0799-01-01
Possible Cause
The battery is discharged.
AC pass-through current is high.
The inverter is running
continuously at high power.
Solution
Do not be alarmed, the unit is performing normally.
Do not be alarmed, the unit is performing normally. The
fan is activated automatically.
Troubleshooting Reference
87